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The 1 piece is a SOLID round rubber seal. The 2 piece is 2 half's that are the same and they fit together.
From a practical standpoint, the differences are great enough that most of the parts are not interchangeable. Whichever block you go with, you'll need to get the correct parts for it.
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Earn +20 ptsQ: What is the difference in one or two rear main seal?
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